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BREAKING NEW GROUND: WACKER’S HyBRID TECHNOLOGy As the specific disadvantages of existing technologies, such as polyurethanes, became more apparent, the greater the need became for viable alternatives. Hybrid systems began to establish themselves in various markets. With the advent of the GENIOSIL ® STP-E polymer range, the shortcomings of hybrid polymers found in the market to date could be overcome. WACKER thereby succeeded in taking the hybrid concept a step further. What Distinguishes Hybrid Polymers? Hybrids are silane-crosslinking organic polymers that can combine advantageous properties typical of both silicones and polyurethanes. Hybrid polymers can be formulated into sealants and adhesives displaying the high elasticity attainable with silicones,– as well as additional benefits such as paintability, rapid cure and high mechanical strength. The latter property was thought to be achievable only with polyurethanes. Thus hybrids are highly versatile yet easy and safe to use. What Makes GENIOSIL ® STP-E Polymers Stand out? Silane-modified polymers generally contain terminal silane components coupled to an organic polymer backbone, allowing curing via hydrolysis and subsequent condensation. WACKER’s STP-E technology includes a new selection of silane-terminated polyethers that, via unique and patented synthesis, exhibit a number of unparalleled properties. 4 Hybrids: Benefits at a Glance SILICONES UV-resistant, high elasticity HyBRIDS + Easy processing, broad adhesion profile -HyBRIDS + Fast and reliable curing, tin-free formulations, long shelf-life Unique Chemistry GENIOSIL ® STP-E polymers have a polyether chain as their organic polymer backbone with di- or trialkoxysilyl end-groups. This structure is achieved through urethane coupling, with an aliphatic bridge positioned between the urethane group and the silane component. In those grades commercially available at WACKER, this aliphatic bridge is either a methylene or a propylene group. The methylene group leads to an -silane-terminated polyether, the propylene group results in a -silane-terminated polyether. (The advantages possible with -silaneterminated polymers will be outlined later.) For Outstanding Properties WACKER’s silane-terminated polymers render adhesive and sealant systems that build on traditional systems but which eliminate a number of drawbacks previously regarded as insuperable. The complete functionalization of the polymers during their synthesis means no residual tack in finished products. The resultant polymers are low in viscosity and easy to handle during compounding – even allowing for higher filler loading. At the same time, the systems are easy to gun. These polymers thus possess the characteristics the formulator is familiar with from existing systems – isocyanate-free, paintable, solvent-free – yet take him a step further by offering even more advantages. In 2011, the industry recognised WACKER’s achievements in this area. 1) POLyURETHANES Paintable, good mechanical properties 1 Frost & Sullivan New Product Innovation Award 2011 What are hybrids? Hybrids are silanecrosslinking organic polymers that combine properties typical of both silicones and polyurethanes. They are highly versatile yet easy and safe to use as they are isocyanate- and solventfree and – in case of the -hybrids – do not require tin-catalysts for curing.
Application Example 1: A New Generation of Joint Sealers Traditionally, containers and refrigeration units have been sealed with a silicone sealant, but the subsequent joint seal could not be painted. Furthermore, silicone-based systems tend to be too soft and flexible compared with an elastic adhesive that combines sealing properties with mechanical reinforcement, giving the joint the required structural stiffness. Hybrids have thus established themselves in this demanding application, where paintability, high temperature resistance and good mechanics are of the essence. Such sealers based on GENIOSIL ® STP-E polymers are the product of choice in this ever-growing application area. 5
Page 1 and 2: 1 VERSATILITy STARTS HERE: -HyBRIDS
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